Katy Perry debuted the music video today for her new single “Last Friday Night” on Funny or Die. The video has Perry, as 13-year-old “Kathy Beth Terry”, waking up from a crazy party, and the video features cameos from a wide range of celebrities, including Glee castmembers, Kenny G, Rebecca Black, Hanson, Corey Feldman, and more. Leading up the video’s premiere, Perry released viral videos of herself in character. Check out the new music video after the break, and watch some of the viral videos.